Rubber compounds are a mixture of polymers, fillers, anti-oxitives and curatives. Various combinations can improve specific properties. Special compounds can be made to broaden temperature range or improve fluid resistance. These may add to lead time, but can lead to better application performance.
- Hydrogenated Nitrile
- Liquid Silicone Rubber
- Medical Ethylene Propylene
- Medical Fluorocarbon
- Medical Grade Silicone
- Natural Rubber
- Nitrile (Buna-N)
- Nitrile (Buna-N)
- Polyurethane, Cast
- Polyurethane, Millable
- Styrene Butadiene
- Teflon® Virgin
- Vamac® [Ethylene / Acrylic]
- Teflon . . . DuPont Performance Elastomers
- TFM . . . Dyneon
ASTM D1418 Designation: FEP
ASTM D2000/SAE J200 Type, Class: N/A
Apple Compound Designation: TF
Standard Color: White
Description: Teflon is a tough, chemically inert polymer possessing an incredible working temperature range.
Key Use(s): Seals for wide chemical exposure situations, with special emphasis on temperature extremes.
For static and SLOW INTERMITTENT dynamic situations.
Temperature Range: Standard Compound: -300° to +450°F.
Hardness (Shore A): 98.
Features: Teflon is inert to virtually all industrial chemicals, even at elevated temperatures. Seals fabricated from this material feature outstanding weather resistance, high resistance to ozone, and high resistance to the degrading effects of exposure to such solvents as acetone, MEK, and xylene. Possessing average elastomer characteristics of 2,500 to 3,500 psi tensile strength, and 300% elongation, they are tough, impact resistant, low friction, non-twisting performers over an extremely wide temperature range.
Limitations: Teflon is hampered by very poor elastic memory at room, or low temperatures. This presents problems in O-ring installation, requiring extra care to be taken in control over O-ring I.D. stretch. Heating Teflon in boiling water, or in a controlled oven, to 200°F is said to enable an O-ring stretch of 10 to 20% to be achieved, thereby assisting installation, and helping to assure a tight fit.
Because of its poor tear resistance, during O-ring installation particular care should be taken to avoid nicking or scratching Teflon, as imperfections will cause O-ring leakage.
Finally, the tendency of virgin Teflon to cold flow over time, when used in gasket type applications, may require special material compounding (with fillers) to control such "creep" in critical sealing situations.
Recognizing seal feedability problems during the production process often occurs too late for a simple solution. That’s why we created a video that outlines exactly what you need to be on the lookout for.